package com.wlxy.springbootdemo.service;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.wlxy.springbootdemo.utils.Pako_GzipUtils;
import com.wlxy.springbootdemo.utils.ResponseDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 实时保存的websocket地址
 * @author thinkpad
 */
@ServerEndpoint("/{userId}")
@Component
public class WebSocketServer {
    private static final Logger log = LoggerFactory.getLogger(WebSocketServer.class);
    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static int onlineCount = 0;
    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static ConcurrentHashMap<String, WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;
    /**
     * 接收userId
     */
    private String userId = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("userId") String userId) {
        this.session = session;
        this.userId = userId;
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            webSocketMap.put(userId, this);
            //加入set中
        } else {
            webSocketMap.put(userId, this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }
        System.out.println("用户连接:" + userId + ",当前在线人数为:" + getOnlineCount());

    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if (webSocketMap.containsKey(userId)) {
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        System.out.println("用户退出:" + userId + ",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        if (null != message && message.length() != 0) {
            try {
                if ("rub".equals(message)) {
                    return;
                }
                //注意，发送给后端的数据默认是经过pako压缩过后的。后台拿到数据需要先解压。
                String unMessage = Pako_GzipUtils.unCompressURI(message);
                //记录器Trace跟踪是否激活
                if (log.isTraceEnabled()) {
                    log.trace(unMessage);
                }
                //转json
                JSONObject jsonObject = JSON.parseObject(unMessage);
                //遍历广播
                for (String key : webSocketMap.keySet()) {
                    if (key == this.userId) {
                        continue;
                    }
                    System.out.println(key);
                    if ("mv".equals(jsonObject.getString("t"))) {
                        webSocketMap.get(key).sendMessage(JSON.toJSONString(new ResponseDTO(3, key, key, unMessage)));
                    } else if (!"shs".equals(jsonObject.getString("t"))) {
                        webSocketMap.get(key).sendMessage(JSON.toJSONString(new ResponseDTO(2, key, key, unMessage)));
                    }

                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("用户错误:" + this.userId + ",原因:" + error.getMessage());
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }

    /**
     * 发送自定义消息
     */
    public static void sendInfo(String message, @PathParam("userId") String userId) throws IOException {
        System.out.println("发送消息到:" + userId + "，报文:" + message);
        if (userId != null && webSocketMap.containsKey(userId)) {
            webSocketMap.get(userId).sendMessage(message);
        } else {
            System.out.println("用户" + userId + ",不在线！");
        }
    }

    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }
}
